Yamanaka (17-0-2, 12 KOs), making his second defense of the title he won in April, sent the challenger to the canvas with a left and Rojas (39-14-1) was unable to move for several minutes but left the ring under his own power. Photos by Naoki Fukuda

In another bout, Japan's Toshiyuki Igarashi (17-1-1, 10 KOs) outpointed Argentina's Nestor Narvaes (19-1-2) via a close twelve round majority decision in his first defense of his WBC flyweight title.